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Leases (Lease Assets and Liabilities) (Details) - USD ($)
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment $ 7,024,000  
Document Period End Date Sep. 30, 2019  
Assets    
Operating lease assets $ 107,906,000  
Finance lease assets 12,451,000  
Total leased assets 120,357,000  
Current    
Operating lease liabilities 34,179,000  
Finance lease liabilities 1,229,000  
Long-term    
Operating lease liabilities 76,390,000  
Finance lease liabilities 14,840,000 $ 16,140,000
Total lease liabilities $ 126,638,000